Advanced Concepts and Applications

Concentrating light in Cu(In,Ga)Se2 solar cells

[+] Author Affiliations
Martina Schmid, Min Song, Berit Heidmann, Steven Kämmer

Helmholtz-Zentrum Berlin, Nanooptische Konzepte für die PV, Berlin, Germany

Freie Universität Berlin, Department of Physics, Berlin, Germany

Guanchao Yin, Shengkai Duan, Diego Sancho-Martinez, Tristan Köhler, Phillip Manley

Helmholtz-Zentrum Berlin, Nanooptische Konzepte für die PV, Berlin, Germany

Martha Ch. Lux-Steiner

Freie Universität Berlin, Department of Physics, Berlin, Germany

Helmholtz-Zentrum Berlin, Berlin, Germany

J. Photon. Energy. 7(1), 018001 (Feb 08, 2017). doi:10.1117/1.JPE.7.018001
History: Received September 26, 2016; Accepted January 13, 2017
Text Size: A A A

Abstract.  Light concentration has proven beneficial for solar cells, most notably for highly efficient but expensive absorber materials using high concentrations and large scale optics. Here, we investigate the light concentration for cost-efficient thin-film solar cells that show nano- or microtextured absorbers. Our absorber material of choice is Cu(In,Ga)Se2 (CIGSe), which has a proven stabilized record efficiency of 22.6% and which—despite being a polycrystalline thin-film material—is very tolerant to environmental influences. Taking a nanoscale approach, we concentrate light in the CIGSe absorber layer by integrating photonic nanostructures made from dielectric materials. The dielectric nanostructures give rise to resonant modes and field localization in their vicinity. Thus, when inserted inside or adjacent to the absorber layer, absorption and efficiency enhancement are observed. In contrast to this internal absorption enhancement, external enhancement is exploited in the microscaled approach: mm-sized lenses can be used to concentrate light onto CIGSe solar cells with lateral dimensions reduced down to the micrometer range. These micro solar cells come with the benefit of improved heat dissipation compared with the large scale concentrators and promise compact high-efficiency devices. Both approaches of light concentration allow for reduction in material consumption by restricting the absorber dimension either vertically (ultrathin absorbers for dielectric nanostructures) or horizontally (microabsorbers for concentrating lenses) and have significant potential for efficiency enhancement.

Figures in this Article
© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Martina Schmid ; Guanchao Yin ; Min Song ; Shengkai Duan ; Berit Heidmann, et al.
"Concentrating light in Cu(In,Ga)Se2 solar cells", J. Photon. Energy. 7(1), 018001 (Feb 08, 2017). ; http://dx.doi.org/10.1117/1.JPE.7.018001


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.